Pin back for earring



FIG. 1 is a view in perspective of a pin back for mounting an earring showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a view in right side elevation thereof, the left side elevation being a mirror image thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a sectional view taken along the line 5--5 of FIG. 2. 

The ornamental design for pin back for earring, as shown and described. 